I've had 1 unread email showing with an empty smart mail box (unread) for the entire time I've owned my new MacBook Pro M5. No other folders show this.
I've gone to my gmail server for every email address that I own and no junk nor deleted item is shown in any of them. No other folders show this unread email. Only the smart mailbox for unread messages shows this.
I've tried everything I could for over a year with no luck.
How do I delete this and get rid of this 1.